Spark plug a17dv, diagram, applicability, characteristics

In accordance with the requirements of OST 37.003 081-98, the spark plug has the following symbols (see Fig. 13).

Rice. 13. Option for the symbol of domestically produced candles

1. Thread on the body M 14×1.25 – “A”: M 18×1.5 (according to specifications) – “M”

2. Hexagon wrench size: 16.0 mm – “U”; 19.0 mm - “M”.

If the marking does not contain the letters “U” or “M”, the hexagon wrench size is 20.8 mm.

3. Conical bearing surface: “K”.

4 Length of the threaded part of the body for spark plugs with a conical seat: 7.8 mm – “M”: 17.5 mm – “D”: 25.0 mm – “C” If the marking does not contain the letters “M”. “D” or “C” before the heat rating designation, the length of the threaded part of the body is 11.2 mm.

5. Heat number: 8: 11: 14; 17; 20; 23 or 26.

6. Length of the threaded part of the body for spark plugs with a flat supporting surface: 19.0 mm - “D”. If the marking does not contain the letter -D", the length of the threaded part of the housing is 12.7 mm, with the exception of spark plugs with a hexagon wrench size of 19.0 mm. for which there is only one size - 9.5 mm.

7. Protrusion of the thermal cone of the insulator beyond the end of the housing: “B”.

8. Presence of a built-in resistor: “P”.

9. Bimetallic central electrode: “M> (with a copper core).

10. Serial number of development or modernization (except for basic designs): one or two digits at the end of the marking.

An example of a symbol for a spark plug with a thread on the body M 14×1.25, heat number 17, length of the threaded part of the body 19.0 mm, having a protrusion of the thermal cone of the insulator beyond the end of the body, with a built-in noise suppression resistor, with a bimetallic central electrode and having a basic design : A17DVRM

In addition to the type designation, each candle must indicate: date of manufacture (month or quarter, or the last two digits of the year of manufacture);

manufacturer's name or trademark; country of manufacture.

Design features of spark plugs

A seemingly simple detail has many nuances. Let's list the main ones:

1. The heat value characterizes the rate of heat transfer from the electrodes to the spark plug skirt. During operation, the spark plug must be heated to such a temperature that the carbon deposits on it oxidize without having time to build up, but overheating is also dangerous for it: glow ignition may occur, and the electrodes themselves will begin to rapidly deteriorate. The problem is that the heat load on the spark plug itself is uneven - when driving at low speeds, the heating is much less than when driving with the pedal to the floor. Candles with a standard heat rating in both of these cases will operate at the extreme point of the optimal mode - under- and overheat, respectively.
2. The spark gap depends primarily on the power of the standard ignition system and the maximum pressure in the cylinder at the end of the compression stroke: it must be such as to ensure reliable spark breakdown even at low voltage in the network (cranking with a starter on a dead battery). And the difference in this case is obvious: usually the transformation coefficient of the ignition coils is about 2000, that is, when the generator is running, they can produce up to 28 kilovolts, but when starting up - only 14! Consequently, the purchased set of spark plugs must have exactly the same gap as set by the car manufacturer: an increased one means the risk of misfire (but within the capabilities of the coil it will provide a more powerful spark that ignites the mixture better), a reduced one guarantees the possibility of starting with a dead battery, but is fraught with interruptions already from - to reduce spark energy.
3. The sticking out of the electrodes also means a lot for the performance of the spark plug in a particular engine. For example, on eight-valve engines, where the spark plug is located on the side of the combustion chamber, increasing the offset optimizes the ignition of the mixture: the area adjacent to the walls of the combustion chamber is less ventilated, while moving the electrodes further ensures that there will be a high-quality, easily ignitable mixture in the spark gap. For VAZ eight-valve engines, where the ventilation of the combustion chamber is structurally deteriorated (the intake and exhaust channels are located in the same direction, and not opposite each other), this is quite sensitive. Spark plugs with electrodes recessed inside are used, as a rule, on multi-valve engines with a minimum volume of the combustion chamber, otherwise they may collide with the valves or piston.
4. The number of electrodes in real operation is fundamentally small. Multi-electrode spark plugs theoretically have an increased service life - when erosion destroys one of the side electrodes, a spark begins to strike the other (unlike a common misconception, a spark does not occur simultaneously between several electrodes). In practice, the spark usually “floats” (which is why it seems that there are several of them) - under conditions of poor distribution of the mixture throughout the cylinder, the spark can move from the working area to the “shaded” area, that is, contaminated with residual exhaust gases. As a result, instead of improving the service life, we will get a deterioration in engine performance, which, again, is fundamental for the VAZ eight-valve engine, which already idles disgustingly with the lean mixture prescribed by current economic standards.

Video: Testing spark plugs on a bench.

Something else useful for you:

• Selection of NGK spark plugs: decoding and marking
• What is the heat number of spark plugs: heat number from different manufacturers
• Replacing spark plugs - frequency and replacement procedure

Candle parameters

Overall and connecting dimensions are the pitch and diameter of the thread on the contact part, which is screwed into the cylinder, the size of the hexagon and the length of the threaded part.
These dimensions correspond to each individual type of engine, since the seat on the cylinders has its own design size. The drip number is an indicator of the level of thermal property that shows how the plug heats up depending on the various thermal loads of the engine. If it has a small drop number, then it is called hot. Its thermal cone heats up to 900º C. They are used on low-power engines with a low compression ratio. Cold spark plugs are those in which ignition occurs under high thermal loads; accordingly, they are used for highly accelerated engines.

The size of the spark gap. This value is usually indicated in the vehicle operating rules and has limits from 0.5 to 2 mm. The gap can be structurally adjustable.

NGK Iridium Spark Plugs

UAZ contact ignition system, composition and general structure, diagrams of the contact ignition system.
procedure for installing the ignition on a UAZ car; wiring diagram for electronic ignition on a UAZ. Iridium ngk spark plugs are considered the best solution, as they have excellent quality. Iridium is a noble metal and the hardest. This metal melts at a temperature of 2450 degrees. If you compare an iridium spark plug with a regular spark plug, it will last you twice as long.

NGK iridium spark plugs have a platinum plate on the middle electrode. It provides high spark plug power even in difficult conditions. These spark plugs have a thin middle electrode and less voltage is required during ignition.

Innovative technologies have developed such a system that electrical charges occur in the annular gap between the middle electrode and the insulator. Thanks to this, soot particles that collect in this area are removed. The self-cleaning effect of such candles extends their lifespan.

Characteristics

Let's start with the main characteristics. The length of the thread of the AU17DVRM spark plug is 1.9 cm; a 16 mm hexagon is used to unscrew and screw the devices into the engine. One of the main characteristics is the gap, which in this case is 1 mm. If we talk about stability, then these SZ cannot boast of it, especially if we compare this brand with the Bosch and NGK brands. If you believe the manufacturer, then SZ AU17DVRM are produced using modern technologies and innovations, which makes it possible to achieve a high quality product.

Non-traditional schemes

Gas-53 diagram - car diagrams. gas ignition circuit 53

Some of the design solutions in spark plugs of an unconventional design can be called conditionally working - by improving one thing, they worsen another. The simplest example is the NGK V-Line series of spark plugs: their central electrode has a groove, so the spark always jumps between the edge of the electrode and the side one. In theory, this improves ignition of the mixture by moving the spark into a better ventilated space and stabilizing the spark point, but the erosion of such a central electrode is accelerated.

Some of the candles on the market cannot be classified as anything other than “Herbalife” from the car market: all sorts of “pre-chamber”, “torch” and so on candles, at best, work no better than standard ones, at worst, they quickly deteriorate. For example, in the notorious “Bugaets” candles, the soldered skirt not only worsened the ventilation of the spark gap, but also burned out, and sometimes went into “free flight” into the combustion chamber. Of the designs that are workable, but useless in the practice of an ordinary motorist, we note only spark plugs that do not have a side electrode at all - they were originally created to work in ultra-high boost engines in order to avoid overheating of the protruding side electrodes; in a normal city cycle on a “civilian” boost level motor, they They clean themselves disgustingly and guarantee rough idling even on ideal quality gasoline.

Noble metals: practical meaning of application

Wiring diagram of the ignition switch VAZ 2108. ignition switch block VAZ 2109

As we already said in the last paragraph, the transition to a multi-electrode circuit did not bring much practical benefit in increasing the service life of spark plugs. In fact, the fight against the very cause of natural wear of spark plugs, that is, erosion of contacts, was replaced with a palliative - the substitution of “spare” ones. To increase the immediate reliability of the electrodes, the design of the spark plugs was significantly redesigned.

In “platinum” and “iridium” spark plugs, the main feature that catches the eye is a very thin central electrode, which precisely localizes the point of origin of the spark - opposite it, a plaque of the corresponding metal is soldered on the side electrode, and the central electrode is also covered with it.

The advantages of such candles are obvious: the electrodes have a service life that, under normal conditions, is two to three times longer than that of conventional candles. The thin central electrode is perfectly self-cleaning, which also contributes to reliable operation.

The disadvantages, alas, are also significant. The first is the price: a set with the Platinum or Iridium inscription will cost at least two to three times more than regular candles. The second, oddly enough, is tenderness: non-fading carbon deposits instantly kill such candles, and mechanical cleaning is contraindicated for them, just like the old-fashioned burning with a torch. First of all, we are, of course, talking about the notorious ferrocene, which is still not uncommon to encounter.

Top 7. Finwhale FS21

Rating (2021): 4.57

High-quality copy protection Candles that are maximally protected from counterfeiting. They have several distinctive quality marks, which reduces the number of fakes to a minimum.

• Characteristics

  Average price: 213 rub.

• Country: Germany
• Center electrode: nickel
• Center electrode diameter (mm): 3
• Number of side electrodes: 2
• Gap (mm): 0.7
• Heat number: 21
• Thread length/diameter (mm): 19/14

The modern market is full of low-quality fakes. If you take an unknown Chinese brand, of course no one will copy it, but if you turn to the top brands, an incredible number of copies of very illegal quality immediately pop up. This spark plug has the best level of copy protection. Original packaging in addition to the serial number, which is easy to check. Equipped with codes and a complex hologram, which is very expensive to copy. There are no complaints about the quality either. This is an excellent analogue of NGK with a nickel central electrode. And two side modules significantly increase the life of the candle.

Advantages and disadvantages

• High level of security against counterfeiting
• Recommended for French cars

• An infrequent guest on retail store shelves

Interchangeability of spark plugs - table.

26.09.2015

The spark plug is a small, but very important part of any car, because thanks to it, ultimately, an electrical discharge is created, which guarantees a confident start of a cold engine, good throttle response, stable idling, no cylinder misfires, etc.

This is why it is so important to regularly (at every oil change) monitor the condition of the spark plugs and replace them on time. Moreover, it is better to do this replacement according to the manufacturer’s recommendations - with an original part, but, unfortunately, this is not always possible, fortunately there is such a thing as the interchangeability of spark plugs

What can you change for what?! Let's look at the most common types of spark plugs in our country and their analogues.

Spark plug interchangeability table.

Note. * non-standard designation of a spark plug with two “ground” electrodes. n.d. - no data. The completeness and spark gaps of analogue spark plugs may differ.

Now let's look at the table in more detail.

A17DV.

Country of origin: Russia.

On which cars it is used: VAZ 2101-2107 and their modifications until 1988.

Analogues:

• BOSCH (Germany) – W7D;
• NIPPON (Japan) – DENCO W20EP-U;
• NGK (Japan) – BP6ES;
• AC DELCO (USA) – 42XLS;
• BRISK (Czech Republic) – L15YC;
• BERU (Germany) – 14-7DU;
• CHAMPION (USA) – N9Y;
• EYQUEN (France, Italy) – 750LS.

A17DVM.

Country of origin: Russia.

On which cars it is used: VAZ 2101-2107 and their modifications until 1988.

Analogues:

• BOSCH (Germany) – W7DC;
• NIPPON (Japan) – W20EP-U;
• AC DELCO (USA) - C42XLC;
• BRISK (Czech Republic) – L15YC;
• CHAMPION (USA) – N9YC;
• NGK (Japan) – BP6ES;
• BERU (Germany) – 14-7DU;
• EYQUEM (France, Italy) – C62LS.

A17DVRM.

Country of origin: Russia.

On which cars it is used: VAZ 2104-2111 and all their modifications.

Analogues:

• BERU (Germany) – 14R-7DU;
• BOSCH (Germany) – WR7DC;
• NIPPON (Japan) – W20EPR;
• AC DELCO (USA) – CR42XLC;
• BRISK (Czech Republic) – LR15YC;
• NGK (Japan) – BPR6ES;
• CHAMPION (USA) – RN9YC.

A10.

Country of origin: Russia.

On what vehicles is it used: ZIL-157KD and its modifications.

Analogues:

• BOSCH (Germany) – W9AC;
• AC DELCO (USA) – 46F;
• BRISK (Czech Republic) – N19;
• NGK (Japan) – B4H;
• BERU (Germany) – 14-10A;
• AUTO LITE (USA) – 416;
• CHAMPION (USA) – L90.

A20D.

Country of origin: Russia.

On what vehicles is it used: AZLK, IZH.

Analogues:

• BOSCH (Germany) – W6CC;
• MARELLI (Italy) – 7LPR;
• BRISK (Czech Republic) – L14;
• NGK (Japan) – B7ES;
• BERU (Germany) – 14-6CU;
• AUTO LITE (USA) – 4054;
• CHAMPION (USA) – N3C.

A14B and A14B-2.

Country of origin: Russia.

On which vehicles is it used:

• GAZ-24;
• buses: RAF, ErAZ;
• motorcycles: “Dnepr” and “Ural”.

Analogues:

• BOSCH (Germany) – W8BC;
• AC DELCO (USA) – 43FS;
• BRISK (Czech Republic) – N17YC;
• NGK (Japan) – BP5HS;
• BERU (Germany) – 14-8B;
• CHAMPION (USA) – L92YC;
• AUTO LITE (USA) – 275;
• MARELLI (Italy) – F7NC;
• NIPPON (Japan) – W14FP;
• EYQUEN (France, Italy) – 550S.

A14D.

Country of origin: Russia.

On what cars is it used: GAZ-3102.

Analogues:

• BOSCH (Germany) - W8CC;
• BRISK (Czech Republic) – L17C;
• NGK (Japan) – B5ES;
• BERU (Germany) – 14-8C;
• CHAMPION (USA) – N5C;
• AC DELCO (USA) – 43XL;
• MARELLI (Italy) – CW6L;
• NIPPON (Japan) – W17ES;
• AUTO LITE (USA) – 394;
• EYQUEN (France, Italy) – 600L.

A11 and A11-3.

Country of origin: Russia.

On which cars it is used: GAZ, ZIL, UAZ.

Analogues:

• BOSCH (Germany) – W9AC;
• BRISK (Czech Republic) – N19;
• NGK (Japan) – B4H;
• BERU (Germany) – 14-10A;
• CHAMPION (USA) – L86C;
• AUTO LITE (USA) – 416;
• MARELLI (Italy) – CW4N;
• AC DELCO (USA) – 45F, 420Z;
• EYQUEN (France, Italy) – 406.

A14DV.

Country of origin: Russia.

On what cars is it used: GAZ-14, GAZ-3102 and its modifications.

Analogues:

• BOSCH (Germany) – W8DC;
• AC DELCO (USA) – 43XLS;
• BRISK (Czech Republic) – L17C;
• NGK (Japan) – BP5ES;
• BERU (Germany) – 14-8DU;
• CHAMPION (USA) – N11YC;
• MARELLI (Italy) – CW6LP;
• AUTO LITE (USA) – 55;
• EYQUEN (France, Italy) – 600LS.

Top 6. BERU Z12

Rating (2021): 4.62

Stable spark Spark plug with three side electrodes, which ensure stable operation and virtually eliminate the disappearance of the spark.

• Characteristics

  Average price: 280 rub.

• Country: Germany
• Center electrode: nickel
• Center electrode diameter (mm): 3
• Number of side electrodes: 3
• Gap (mm): 0.8
• Heat number: 12
• Thread length/diameter (mm): 19/14

Increasing the number of side electrodes is aimed at stabilizing the spark during operation. If it doesn't work on one electrode, it will definitely work on the other. This significantly improves spark plug efficiency and extends its life as the load is distributed among the larger modules. This model uses three side electrodes at once. True, the central module is nickel, not platinum or iridium, which explains the quite adequate price tag. The recommended spark plug life is 50 thousand kilometers, which is a very good result for nickel modules. And these are not empty numbers. The brand values ​​its reputation too much to throw words to the wind.

Advantages and disadvantages

• High resource for nickel spark plug
• Many side electrodes

• Custom head size

Applicability of spark plug NGK BPR6ES-11

Suitable for cars and engines

NGK BPR6ES-11 on Mitsubishi

Installed on Mitsubishi cars

Colt CJ1A 1.3i 4G13 after 6.2000 Colt C12A 1.5 G15B with catalyst 8.1984- C52A 1.5i 4G15 83 hp Lancer C61A) 1.3 12V (4G13) to 4.1991 (C12A) 1.5 (G15B) with catalyst 8.1984- Lancer 4WD C77A 1.8i 4G37 Sigma (F16A) Sigma Wagon (F07W) 3.0i SOHC 12V (6G72) Galant E15A 2.0 4G6 3) with catalyst E33A Eclipse D21A 1.8i 4G37 (D32A) 2.0i Turbo 4G63T L200 4WD K33T 2.6 G54B L300 (P04V/W, P14V, P24V/W) 2.4i 4G64 Pajero (L042G) 2.6 +kat (L047G) 2.6 4G 54 with Space Wagon N34W catalyst 2.4i 4G64 produced before May 1992 right-hand drive Mitsubishi Eterna Sava (E32A) 1.8 4G37 Lancer Mirage Wagon 4WD C37W 1.8i 4G37

The main criteria by which selection is carried out

Products from various brands

Modern motors are manufactured with certain design features that provide them with certain technical characteristics. For normal operation of the power unit, it is necessary to install an SZ, with certain parameters corresponding to the type of car engine

When choosing an analogue of SZ, you should pay attention to their main parameters:

1. Screw-in dimensions:

• length of the threaded part;
• thread pitch;
• thread diameter;
• turnkey hexagon dimensions.

We recommend: Motor oil ZIC X7 LS 10w-40

Products with overall and connecting dimensions that do not correspond to the engine type cannot be mounted on the power unit. The use of devices with a threaded part that is too long or short, in most cases ends in a major overhaul of the car engine.

1. The thermal part of the analogue should be as close as possible to the characteristics of the original. We are talking about the heat number, which reflects the ability of candle products to heat up at different thermal loads of the engine. Please note, when selecting SZ for compatibility, that domestic products are marked indicating the heat number, while foreign ones are divided into cold (having a large heat number) and hot (having a small heat number).
2. The distance between the spark plug contacts must correspond to the size specified in the machine manual. An increased spark plug gap will lead to a decrease in spark power, and a reduced gap will lead to breakdowns in the ignition system.
3. Number of spark plug electrodes. Many motorists are of the opinion: the more spark plug contacts, the stronger the sparking. This is an erroneous statement; the spark occurs between two contacts. In multi-contact devices, the operating principle is as follows: if one electrode burns, sparking will occur on the second. Such modernization of the SZ design makes it possible to increase their operational period, but does not affect the spark power.
4. The material from which the spark plug contacts are made. It is possible to buy iridium, platinum or classic candles. The operational period of the product, the rate of formation and the power of the spark depend on the material of their contacts.

We recommend watching a video about how the SZ marking is deciphered:

Domestic or foreign, how to choose?

Different types of protective equipment from one manufacturer

Candles from foreign manufacturers do not have specific labeling requirements. Russian products must contain symbols indicating the following information:

• name of the manufacturer or company logo;
• date of manufacture;
• designation “made in Russia” or RUS;
• markings that comply with state standards.

Foreign candles are marked according to a similar principle to domestic devices. However, their designation is deciphered differently. Products of different brands, for example “BRISK” and “NGK” with the same parameters have different designations. The lack of generally accepted labeling standards significantly complicates the selection of an analogue

To choose the right SZ, you should use the table of interchangeability of spark plugs or pay attention to the packaging of the spark plug, it contains information indicating for which types of engines the SZ is suitable

Table. Selection of the main types of protective equipment from different brands based on compatibility.

If it is impossible to find an analogue for candles, then a dash is placed in the table.

How to check spark on a spark plug

If you experience unstable engine operation, it begins to “triple”, it is quite possible that it is time to change the spark plugs, or the PVN, or the ignition module needs to be replaced. So, first, let's check the spark plugs of the VAZ 2114, most often the reason is in them.

• We remove the PVN tips from the spark plugs
• Unscrew all 4 spark plugs (you will need a 21 key)
• We put the tip on the spark plug and lean it against the metal (possibly against the body of the engine block)

We start turning the starter and look at the spark plug, if there is a spark, then the spark plug is working. We do the same actions with other candles.

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What can candles say?

The condition of the spark plugs can indicate existing problems with the engine. For example, if the electrode is covered with black carbon deposits, this indicates an enriched fuel-air mixture. As a rule, such engines simultaneously experience increased fuel consumption. But if there is light gray or white carbon deposits on the electrode, then the engine is running on a lean mixture, which can lead to overheating of the combustion chamber.

If there is a small skirt with a reddish tint on the central electrode, this indicates a high content of various additives in the fuel. As a rule, such deposits are also found inside the engine. Accordingly, it will be necessary to clean the engine using ultrasound and special injector cleaners.

If there are oil smudges on the spark plugs, this indicates increased oil consumption and problems with the valve stem seals. Such an engine has a bluish exhaust color and a characteristic smell of exhaust gases.

Pros and cons of iridium spark plugs

Companies that produce vehicles do not forget to work on improving the operation of such an important part as the spark plug. The technical characteristics of the candles and their service life depend on the quality of the material used.

Innovative technologies have made it possible to use iridium in candles. Its alloy is used in the manufacture of central electrodes for spark plugs. The core in iridium spark plugs is small, smaller than in similar spark plugs. The use of such spark plugs allows the engine to develop maximum permissible power.

Laser welding is used to weld the iridium tip to the electrode circumference. This candle is very reliable.

Iridium spark plugs improve engine economics. The smaller the center electrode of the spark plug, the better the engine performance.

The advantages of such candles are obvious. Their advantages:

• The power of the engine used is increased by up to four percent.
• The engine starts easily and simply even at low temperatures.
• Less fuel is consumed. Save up to seven percent.
• The service life of candles increases almost three times.

They also have their disadvantages.

Features of production technology

Frequency of replacement of spark plugs. spark plug tester. spark plug gap

One of the stages of manufacturing Bosch products Bosch engineers invented the world's first spark plug. Since then, BOSCH spark plugs have been installed by leading automakers when producing cars. This is due to the high quality of Bosch products, the compliance of their designs with generally accepted requirements. Depending on the design of the candle, the materials used in its manufacture, as well as the area of ​​application of the SZ, various requirements are imposed on the manufactured products.

Bosch SZs are manufactured not only in Germany; their production is established in Brazil, Russia, China and other countries. At the same time, the same requirements are imposed on the quality of products, regardless of the country of origin. The same level of quality of products is ensured by the centralized preparation of contracts for the supply of raw materials. In addition, specialists from Germany work in other countries and carry out quality control of products.

The range of BOSCH spark plugs includes products for all types of transport; there are practically no car models on which it is impossible to install Bosch spark plugs. The ignition sections of this brand have proven themselves to be excellent for motor-boat transport, block heat and power plants and low-power engines, as well as in motorsports.

You can select BOSCH spark plugs by the markings on the product; you can also use the online catalog https://www.bosch-automotive-catalog.com/ru/ to select spark plugs.

According to the manufacturer's catalog, BOSCH spark plugs are used in various fields:

• cars with gas engines;
• two-wheelers;
• low-power engines;
• industrial equipment.

Please note that there are a lot of counterfeit products on the market, so the Bosch catalogs indicate how much SZ should be in the package, what marking is accepted by the manufacturer

Choosing spark plugs for VAZ

Let's talk about spark plugs using a specific example - the 16-valve VAZ-2110 engine, which is equipped from the factory with A17DVRM spark plugs from the Engels plant. The same plant, by the way, produces original spark plugs for other Russian conveyors: the “EZ” marking can be seen on Renault Original spark plugs, for example. For convenience, we will focus on these candles.

EZ A17DVRM

The main advantage of these spark plugs is the consistency of quality: it is difficult to find large differences in resistance or spark gap size in the original set. It’s not for nothing that we mentioned the word “original” - alas, the market is flooded with either fakes or rejects going on sale. The spark plugs have a good reserve of stopping sparking; with a standard ignition system, they can withstand cranking when the voltage drops to 6V without stopping sparking. They operate stably even at maximum load conditions - misfires, which can be “caught” by a sensitive gas analyzer, are minimal.

As for the resource, they answer their task - to work from maintenance to maintenance - with confidence. Considering their low price and prevalence, they are clearly worthy of recommendation.

EZ T17DVRM

Three-electrode version of the already familiar A17DVRM. The theoretical gain in resource also brought its own disadvantage: the parameters of the spark plugs “float” more, and this is, first of all, an unstable gap, hence some deterioration in motor characteristics. But it should be noted that this deterioration can only be “caught” on a measuring stand; in real operation, it cannot be said that three-electrode spark plugs from Engels will be worse than single-electrode spark plugs.

Denso W20EPR-U11

Excellent candles from one of the world leaders in their production: high and stable manufacturing quality, reliable operation in any mode and a good service life. The spark plugs confidently withstand voltage drops at startup down to 6.5 V (unexpectedly losing to domestic ones!), and misfires with them are minimal.

Their design uses the same solution as the NGK V-Line series, but exactly the opposite: the groove is stamped into the side electrode. This is definitely more profitable in terms of production, since there is no need to strictly orient the side electrode relative to the central one, but there is obviously less practical benefit from such a design.

Brisk LR15YCY-1

Plugs with an increased reach of the central electrode, as expected, did not show an increase in motor performance on a 16-valve engine: this solution would be more “workable” on an eight-valve engine. By all indicators, this is a strong “middle peasant”, but the price is significantly higher than that of competitors with the same qualities. Let us only note the good result for starting on a dead battery: 6.2V is an excellent result... but the original spark plugs from Engels are cheaper and, oddly enough, better than the Czech ones.

NGK BPR6ES-11

The company's marketers clearly made a mistake in classifying these spark plugs as the V-Line series: their central electrode does not have a groove. Let’s say right away: the original kit is a strong “average” product that doesn’t stand out in any way, but doesn’t fail the tests either. I definitely don’t like the noticeable roughness of the workmanship - even the Made in France marking is always printed unevenly, and the side electrode is usually soldered unevenly. One gets the impression that the manufacturing technology was deliberately cruder for the sake of low cost, but these candles could have been better.

The main disadvantage of NGK is not themselves, but the monstrous number of fakes on the market. Just type “spark plug” in a search on Ebay or AliExpress without specifying the brand, and a multi-page list of “NGK type” from China will immediately appear.

Bosch WR7DPX

We will leave these candles out of the rating, given how much more expensive the Platinum series is than its counterparts that do not contain precious metals. However, it is these spark plugs that demonstrate the best results in all motor tests - this is primarily due to the thin central electrode, completely hidden in the insulator: the engine starts when the voltage in the on-board network drops below 6V, which is not available to other plugs, minimal toxicity clearly indicates the smallest amount of misfires.

You will have to try to overheat the central electrode at maximum loads - the design guarantees reliable heat transfer from it to the insulator and then to the skirt. This means that this spark plug can be recommended to both owners of traveling cars and lovers of aggressive driving. Unless, of course, the price stops it.

Top 4. Torch QH5RIU-13

Rating (2021): 4.69

The best Chinese analogue A candle from a little-known brand, which showed excellent test results and strict compliance with the labeling.

• Characteristics

  Average price: 520 rub.

• Country: China
• Center electrode: iridium
• Center electrode diameter (mm): 1
• Number of side electrodes: 1
• Gap (mm): 1.1
• Heat number: 5
• Thread length/diameter (mm): 24/14

This is a Chinese brand that has become increasingly popular in recent years. In terms of popularity, it is unlikely to be able to compete with NGK, but today it is easy to find tests and reviews from real owners online. Including on the well-known portals Drom and Drive2. As practice has shown, the Chinese version, although not the best analogue of the Japanese, is quite worthy. There is an iridium solder, and the declared resource is 80 thousand mileage. Not a bad result, however, the product costs a lot of money. Tests also showed that the spark plug performs well and has all the advantages inherent in iridium models. Perhaps we will soon see a new big name in this market.

Advantages and disadvantages

• Complies with markings
• Fully fulfills the declared resource

• Little information about the brand and product
• Not copy protected at all

Rating of the best spark plugs

They are divided into several categories:

1. Budget - up to 200 rubles;
2. The average price range is from 200 to 500 rubles;
3. Premium – from 500 rub.

BRISK L15Y

This type of spark plug has one central electrode made of a special nickel-based alloy. This allows the spark plugs to work perfectly on engines without catalysts. Has 1 side electrode. The electrodes are resistant to carbon deposits. The outside of the candle is galvanized with zinc for protection.

Characteristics:

• external thread – 14 mm;
• thread length – 19 mm;
• wrench – 16;
• distance between electrodes – 0.7 mm;
• heat number – 15 units.

Price – about 50 rubles. for 1 piece

Top 10. APS AU17DVRM

Rating (2021): 4.33

• Characteristics

  Average price: 203 rub.

• Country Russia
• Center electrode: nickel
• Center electrode diameter (mm): 3
• Number of side electrodes: 1
• Gap (mm): 0.7
• Heat number: 17
• Thread length/diameter (mm): 19/14

Before us is a Russian copy of German Bosch brand candles. And not a fake, but a licensed copy that has all the necessary certificates. In turn, Bosch is a good analogue of NGK and other top brands. The main difference from the original is the price. Modules are much cheaper, but much less attention is paid to copy protection. However, the price tag and low popularity of the brand do not particularly attract unscrupulous pirates. As for quality and reliability, these spark plugs cannot be called the best of their kind, but they strictly correspond to the declared characteristics, and some parameters, such as the recommended mileage, are even greatly underestimated.

Advantages and disadvantages

• Compliance with the stated parameters
• Licensed copy of a popular brand

• Not copy protected

Interchangeability of spark plugs

Table 1. Summary table of interchangeability of hot spark plugs.

Table 2. Summary table of interchangeability of medium candles.

Table 3. Summary table of the interchangeability of cold candles.